I believe that even though the player might want to practice for a Comp REL event, it is important to be consistent in applying the penalties based upon the set guidelines. For example, a newer player could observe the Competitive REL fix, and believe that it is appropriate and what is to be expected at Regular.
The main driver for my philosophy is found in the Introduction of the MTR:
All players are treated equally and share responsibilities according to the Rules Enforcement Level (REL) of the
tournament. Both players and officials should cooperate to achieve their common goal of running a proper DCI sanctioned tournament.
If we apply different penalties / fixes based upon the player or intent to educate, I believe we start to stray from the philosophy of the Magic Tournament Rules in general.